Lifting-jack.



UNITED STATES PATENT OFFICE.

JOHN JOSEPH BRADSHAW, F JERSEY CITY, NEW JERSEY.

LlFTlNG-JACK.-

Specificationof Letters Patent.

Patented May 14, 1907.

Application filed .Tune 23, 1906. Serial No. 323,063-

To all whom it may concern.-

Be it known that 1, JOHN JOSEPH BRAD- SHAW, a citizen of the UnitedStates, residing at Jersey City, in the county of Hudson and State ofNew Jersey, have invented a new and useful Improvement in Lifting-Jacks,of which the following is a specification.

This invention relates to lifting jacks and more particularly to pullinglifting jacks ada ted to be used for replacing cars on trac lis, theobject being to provide a jack so constructed that the object beinglifted can be pulled toward the ack at the same time.

With this object in view, the invention consists in the novel featuresofconstruction, combination and arrangement of parts, hereinafter fullydescribed and pointed out in the claims.

In the drawing forming a part of this specification:- Figure 1 is aperspective view of my improved lifting jack. Fig. 2 is a longitudinalsectional view showing the bar partly broken away. Fig. 3 is atransverse sectional view. Fig. i is a top plan view of the jack withthe lifting bar removed.

In the drawings A indicates a block having upwardly projecting sides A,provided with journal bearings B secured on the top on which the reducedrounded ends C, of the square shaft O is mounted. Secured centrally onthe shaft 0 is a gear wheel D, having ratchet wheels E secured on theshaft to each side of the gear wheel, which are adapted to be engaged bypawls F, mounted on a shaft F, between the sides adjacent its forwardend, which prevents the same from turning forward. Mounted on thereduced ends C, of the shaft C, to each side of the ratchet wheels E,are arms G extending rearwardly and connected together at their ends bya bar I'I, having a rounded upper face for the pur pose hereinafterdescribed.

A bar I is secured between the arms G provided with pawls 1, adapted toengage the ratchet wheels E. A lever bar J, having a toothed portion J,is adapted to be mounted on the gear wheel D, provided with a curved endJ and a socket J in its other end in which is mounted a lever bar K, ofany length desired. The block A is provided with V- sha ed feet Aextending across the rear, at eac end which prevents the block fromslipping when the lever is pushed downwardly.

From the foregoing description it will be readily seen that when the baris pressed down, so as to engage the curved surface of the cross bar H,the pawls I, will engage the ratchet wheels E and revolve the gear wheelD causing the bar to be drawn rearwardly carrying with it, the objectbeing lifted which will be held in that position by the pawls F.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is 1. In a lifting jack, the combinationwith a shaft carrying a gear wheel, of arms mounted on said shaft atoothed lever bar mounted on said gear wheel adapted to engage said armsand means carried by said arms for rotating said shaft for the purposedescribed.

2. In a lifting jack, the combination with a shaft mounted in journalscarrying a gear Wheel, of arms pivotally mounted on said shaft, atoothed lever bar mounted on said gear wheel adapted to engage saidarms, the teeth of the bar meshing with said gear, and means carried bythe arms for rotating said gear for the purpose described.

3. In a lifting jack, the combination with a block having a shaftmounted therein, carrying a gear wheel or ratchet wheel, a tooth barmounted on said gear wheel and arms mounted on said shaft provided withpawls adapted to engage said ratchet wheel and rotate said gear-wheelwhen engaged by said bar, for the purpose described.

4. In a lifting jack, the combination with a block, of a shaft mountedin said block provided with a gear and ratchet wheels, arms mounted onsaid shaft connected together by a cross bar, pawls carried by said armsand a toothed bar mounted on said gear wheel, adapted to engage thecross bar of the arms, for the purpose described.

5. In a lifting jack, the combination with a block carrying a gear andratchet wheel, arms provided-with pawls adapted to engage said ratchetwheel, and a toothed bar mounted on said gear wheel adapted to engagesaid arms, for the purpose described.

6. In a lifting jack, the combination with a block provided withupwardly projecting sides, of a shaft mounted between said sides, a gearwheel secured on said shaft, ratchet wheels fixed on said shaft, armsprovided with pawls, mounted on said shaft, connected together by across bar, a toothed bar IIO block, a gear and ratchet Wheels mounted insaid block, arms pivotally mounted in said block carrying pawls and atoothed lever bar mounted. on said gear adapted to engage said arm, forthe purpose described.

8. In a lifting jack, the combination With a block, of a shaft mountedon said block carrying gear and ratchet-Wheels, arms mounted on saidshaft carrying pawls adapted to engage said ratchet-Wheels and a toothedlever bar mounted on said gear Wheel, adapted to engage said arms, forthe purpose described.

9. In a lifting jack, the combination with a block, provided Withupwardly projecting sides, of a shaft mounted between said sides, a'gearWheel secured on said shaft, ratchet Wheels fixed on said shaft to eachside of said gear Wheel, arms mounted on said shaft con nected togetherat their ends by a crossbar, paWls carried by said arms, a shaftmounted. between the side of the block, carrying paWls adapted to engagesaid ratchet-wheels and a toothed lever bar mounted on said gear adaptedto engage the "crossbar of the arms, for the pur ose described. 7

J HN JOSEPH BRADSHAW.

Witnesses: GUsTAV A. Rirr, Senior, GUSTAV A. RIPP, Jr.

